What greenstuff is suitable for baby chicks?

My chicks are now 7 and 6 days old. I am feeding them chick crumb and they are eating well. I was just wondering if they can have greenstuff yet and if so what sort of things are best.

Above are some recent pics of my girls, The two ginger chicks are pre sexed girls but Daisy the dark one is an unknown breed and sex at present. If you have any idea what breed she might be please let me know.

I recommend anytime you feed them anything other than starter that you make sure they have grit. You can get different opinions as to what they can or cannot eat without grit, but I feel you cannot go wrong making sure they have grit and you might go wrong if you don't supply grit. Purely my personal, non-professional opinion.

After about 2 weeks ,I have given them romaine lettuce leaves, some crumbled up corn bread, and some whole grain pasta with a lil real butter, Ha! They loved it. I like to give them stuff to pick so they don't pick each other.